```html
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>微服务架构核心组件：Eureka服务注册与发现</title>
    <link href="https://cdn.staticfile.org/font-awesome/6.4.0/css/all.min.css" rel="stylesheet">
    <link href="https://cdn.staticfile.org/tailwindcss/2.2.19/tailwind.min.css" rel="stylesheet">
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    <style>
        body {
            font-family: 'Noto Sans SC', Tahoma, Arial, Roboto, "Droid Sans", "Helvetica Neue", "Droid Sans Fallback", "Heiti SC", "Hiragino Sans GB", Simsun, sans-serif;
            color: #333;
            line-height: 1.6;
        }
        .hero-gradient {
            background: linear-gradient(135deg, #6e8efb 0%, #a777e3 100%);
        }
        .card-hover {
            transition: all 0.3s ease;
        }
        .card-hover:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
        }
        .drop-cap:first-letter {
            float: left;
            font-size: 4rem;
            line-height: 0.8;
            margin: 0.2em 0.1em 0 0;
            color: #6e8efb;
            font-weight: 700;
        }
        .icon-highlight {
            color: #6e8efb;
            margin-right: 8px;
        }
        .highlight-box {
            background: linear-gradient(to right, rgba(110, 142, 251, 0.1), rgba(167, 119, 227, 0.1));
            border-left: 4px solid #6e8efb;
        }
    </style>
</head>
<body class="bg-gray-50">
    <!-- Hero Section -->
    <section class="hero-gradient text-white py-20 px-4 md:px-0">
        <div class="container mx-auto max-w-5xl flex flex-col items-center text-center">
            <div class="flex items-center mb-4">
                <i class="fas fa-cloud text-3xl mr-3"></i>
                <span class="text-sm font-semibold tracking-wider uppercase">微服务架构</span>
            </div>
            <h1 class="text-4xl md:text-5xl font-bold mb-6">Eureka 服务注册与发现</h1>
            <p class="text-xl md:text-2xl font-light max-w-3xl leading-relaxed opacity-90">
                Netflix 开源的微服务架构核心组件，实现动态服务发现与负载均衡
            </p>
            <div class="mt-12 flex space-x-4">
                <a href="#features" class="px-6 py-3 bg-white text-indigo-600 rounded-full font-medium hover:bg-gray-100 transition duration-300">
                    <i class="fas fa-star mr-2"></i>核心功能
                </a>
                <a href="#workflow" class="px-6 py-3 border border-white text-white rounded-full font-medium hover:bg-white hover:text-indigo-600 transition duration-300">
                    <i class="fas fa-cogs mr-2"></i>工作原理
                </a>
            </div>
        </div>
    </section>

    <!-- Main Content Section -->
    <div class="container mx-auto max-w-5xl px-4 md:px-0 py-16">
        <!-- Intro Section -->
        <section class="mb-16">
            <p class="drop-cap text-lg md:text-xl leading-relaxed text-gray-700 mb-8">
                Eureka 是一个由 Netflix 提供的服务发现和注册中心，是微服务架构中常用的组件之一。它主要用于帮助微服务之间的通信，使得服务实例能够在动态变化的环境中相互发现和访问。在 Spring Cloud 生态系统中，Eureka 作为服务发现的实现也被广泛使用。
            </p>
            
            <div class="grid grid-cols-1 md:grid-cols-3 gap-8 mb-12">
                <div class="bg-white rounded-xl shadow-md p-6 card-hover">
                    <div class="text-indigo-500 mb-4">
                        <i class="fas fa-sitemap text-3xl"></i>
                    </div>
                    <h3 class="text-xl font-bold mb-3 text-gray-800">服务注册</h3>
                    <p class="text-gray-600">微服务实例启动时自动注册，定期发送心跳保持活跃状态</p>
                </div>
                <div class="bg-white rounded-xl shadow-md p-6 card-hover">
                    <div class="text-indigo-500 mb-4">
                        <i class="fas fa-search-location text-3xl"></i>
                    </div>
                    <h3 class="text-xl font-bold mb-3 text-gray-800">服务发现</h3>
                    <p class="text-gray-600">动态查询其他服务实例信息，实现服务间的通信</p>
                </div>
                <div class="bg-white rounded-xl shadow-md p-6 card-hover">
                    <div class="text-indigo-500 mb-4">
                        <i class="fas fa-balance-scale text-3xl"></i>
                    </div>
                    <h3 class="text-xl font-bold mb-3 text-gray-800">负载均衡</h3>
                    <p class="text-gray-600">结合Ribbon实现客户端负载均衡，优化请求分配</p>
                </div>
            </div>
        </section>

        <!-- Features Section -->
        <section id="features" class="mb-16">
            <h2 class="text-3xl font-bold mb-8 text-gray-800 border-b pb-4 flex items-center">
                <i class="fas fa-star icon-highlight"></i>Eureka 的主要功能
            </h2>
            
            <div class="space-y-8">
                <!-- Feature 1 -->
                <div class="bg-white rounded-xl shadow-md overflow-hidden">
                    <div class="md:flex">
                        <div class="md:flex-shrink-0 bg-indigo-500 md:w-48 flex items-center justify-center p-4">
                            <i class="fas fa-sign-in-alt text-white text-4xl"></i>
                        </div>
                        <div class="p-8">
                            <h3 class="text-xl font-semibold text-gray-800 mb-2">服务注册</h3>
                            <div class="text-gray-600 space-y-4">
                                <p><span class="font-medium">服务实例注册：</span>微服务实例在启动时向 Eureka Server 注册自己的信息，包括服务名、IP 地址、端口号、元数据等。Eureka Server 会保存这些信息，并为其他服务提供查询。</p>
                                <p><span class="font-medium">注册续约：</span>注册的服务实例需要定期向 Eureka Server 发送心跳（续约请求），以表明自己仍然活跃。如果 Eureka Server 在一定时间内没有收到心跳，服务实例会被认为是不可用的并从注册表中移除。</p>
                            </div>
                        </div>
                    </div>
                </div>
                
                <!-- Feature 2 -->
                <div class="bg-white rounded-xl shadow-md overflow-hidden">
                    <div class="md:flex flex-row-reverse">
                        <div class="md:flex-shrink-0 bg-purple-500 md:w-48 flex items-center justify-center p-4">
                            <i class="fas fa-search text-white text-4xl"></i>
                        </div>
                        <div class="p-8">
                            <h3 class="text-xl font-semibold text-gray-800 mb-2">服务发现</h3>
                            <div class="text-gray-600">
                                <p>服务实例可以通过 Eureka Client 向 Eureka Server 查询其他服务的地址和信息。服务发现的过程使得微服务能够动态地找到彼此并进行通信，无需硬编码服务地址。</p>
                            </div>
                        </div>
                    </div>
                </div>
                
                <!-- Feature 3 -->
                <div class="bg-white rounded-xl shadow-md overflow-hidden">
                    <div class="md:flex">
                        <div class="md:flex-shrink-0 bg-blue-500 md:w-48 flex items-center justify-center p-4">
                            <i class="fas fa-random text-white text-4xl"></i>
                        </div>
                        <div class="p-8">
                            <h3 class="text-xl font-semibold text-gray-800 mb-2">负载均衡</h3>
                            <div class="text-gray-600">
                                <p><span class="font-medium">客户端负载均衡：</span>结合 Ribbon（一个客户端负载均衡库），Eureka 可以实现客户端负载均衡，通过动态获取服务实例列表来选择负载最小的服务实例进行请求。</p>
                            </div>
                        </div>
                    </div>
                </div>
                
                <!-- Feature 4 -->
                <div class="bg-white rounded-xl shadow-md overflow-hidden">
                    <div class="md:flex flex-row-reverse">
                        <div class="md:flex-shrink-0 bg-green-500 md:w-48 flex items-center justify-center p-4">
                            <i class="fas fa-shield-alt text-white text-4xl"></i>
                        </div>
                        <div class="p-8">
                            <h3 class="text-xl font-semibold text-gray-800 mb-2">高可用性和容错</h3>
                            <div class="text-gray-600 space-y-4">
                                <p><span class="font-medium">集群模式：</span>Eureka Server 可以以集群模式运行，多个 Eureka Server 实例共同维护注册表，实现高可用性和容错。</p>
                                <p><span class="font-medium">本地缓存：</span>Eureka Client 会缓存服务信息，即使在 Eureka Server 短暂不可用时，也能从本地缓存中获取服务信息，继续进行服务发现。</p>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </section>

        <!-- Components Section -->
        <section class="mb-16">
            <h2 class="text-3xl font-bold mb-8 text-gray-800 border-b pb-4 flex items-center">
                <i class="fas fa-puzzle-piece icon-highlight"></i>Eureka 的关键组件
            </h2>
            
            <div class="grid grid-cols-1 md:grid-cols-3 gap-6">
                <div class="bg-white rounded-lg shadow-md p-6 card-hover">
                    <div class="flex items-center mb-4">
                        <div class="bg-indigo-100 p-3 rounded-full mr-4">
                            <i class="fas fa-server text-indigo-600 text-xl"></i>
                        </div>
                        <h3 class="text-xl font-bold text-gray-800">Eureka Server</h3>
                    </div>
                    <p class="text-gray-600">负责维护服务注册表，并提供服务发现的功能。服务实例通过 REST API 向 Eureka Server 注册自己，并查询其他服务的信息。</p>
                </div>
                
                <div class="bg-white rounded-lg shadow-md p-6 card-hover">
                    <div class="flex items-center mb-4">
                        <div class="bg-purple-100 p-3 rounded-full mr-4">
                            <i class="fas fa-laptop-code text-purple-600 text-xl"></i>
                        </div>
                        <h3 class="text-xl font-bold text-gray-800">Eureka Client</h3>
                    </div>
                    <p class="text-gray-600">微服务实例通过 Eureka Client 连接 Eureka Server。它会定期向 Eureka Server 发送心跳以维持注册状态，同时提供服务发现和负载均衡功能。</p>
                </div>
                
                <div class="bg-white rounded-lg shadow-md p-6 card-hover">
                    <div class="flex items-center mb-4">
                        <div class="bg-blue-100 p-3 rounded-full mr-4">
                            <i class="fas fa-tachometer-alt text-blue-600 text-xl"></i>
                        </div>
                        <h3 class="text-xl font-bold text-gray-800">Eureka Dashboard</h3>
                    </div>
                    <p class="text-gray-600">Eureka Server 提供的 Web 界面，用于查看当前注册的服务实例、它们的状态和健康状况等信息。这有助于监控和管理服务实例。</p>
                </div>
            </div>
        </section>

        <!-- Workflow Section -->
        <section id="workflow" class="mb-16">
            <h2 class="text-3xl font-bold mb-8 text-gray-800 border-b pb-4 flex items-center">
                <i class="fas fa-project-diagram icon-highlight"></i>Eureka 的工作原理
            </h2>
            
            <div class="mb-12">
                <div class="bg-white rounded-lg shadow-md p-6 highlight-box">
                    <div class="text-center mb-8">
                        <h3 class="text-xl font-bold text-gray-800 mb-4">Eureka 工作流程图</h3>
                        <div class="mermaid">
                            sequenceDiagram
                                participant Client as 服务实例
                                participant Server as Eureka Server
                                participant Consumer as 服务消费者
                                
                                Client->>Server: 1. 注册服务
                                Client->>Server: 2. 定期发送心跳
                                Consumer->>Server: 3. 查询服务列表
                                Server-->>Consumer: 4. 返回服务信息
                                Consumer->>Client: 5. 调用服务
                        </div>
                    </div>
                    
                    <div class="space-y-6">
                        <div class="flex">
                            <div class="flex-shrink-0 bg-indigo-500 text-white rounded-full w-8 h-8 flex items-center justify-center mr-4">1</div>
                            <div>
                                <h4 class="font-semibold text-gray-800 mb-2">服务注册</h4>
                                <p class="text-gray-600">微服务实例启动时，通过 Eureka Client 向 Eureka Server 发送注册请求。Eureka Server 接收注册请求，并将服务实例的信息存储在注册表中。微服务实例需要定期发送心跳（续约请求），以通知 Eureka Server 自己仍然活跃。如果 Eureka Server 未在指定时间内收到心跳，它将服务实例标记为失效并从注册表中移除。</p>
                            </div>
                        </div>
                        
                        <div class="flex">
                            <div class="flex-shrink-0 bg-purple-500 text-white rounded-full w-8 h-8 flex items-center justify-center mr-4">2</div>
                            <div>
                                <h4 class="font-semibold text-gray-800 mb-2">服务发现</h4>
                                <p class="text-gray-600">当一个服务需要调用另一个服务时，它通过 Eureka Client 查询 Eureka Server，以获取目标服务的实例列表。Eureka Client 会根据服务的名称获取实例列表，并选择一个实例进行调用。Eureka Client 会缓存服务实例的信息，并定期更新缓存以保持最新状态。</p>
                            </div>
                        </div>
                        
                        <div class="flex">
                            <div class="flex-shrink-0 bg-blue-500 text-white rounded-full w-8 h-8 flex items-center justify-center mr-4">3</div>
                            <div>
                                <h4 class="font-semibold text-gray-800 mb-2">负载均衡</h4>
                                <p class="text-gray-600">Eureka Client 和 Ribbon 结合使用时，Ribbon 会使用 Eureka 提供的服务实例列表来进行负载均衡。Ribbon 会根据负载均衡策略选择一个实例进行调用，以实现负载分担。</p>
                            </div>
                        </div>
                        
                        <div class="flex">
                            <div class="flex-shrink-0 bg-green-500 text-white rounded-full w-8 h-8 flex items-center justify-center mr-4">4</div>
                            <div>
                                <h4 class="font-semibold text-gray-800 mb-2">故障处理</h4>
                                <p class="text-gray-600">如果 Eureka Server 本身出现故障，其他 Eureka Server 实例可以继续提供服务注册和发现功能。客户端还会缓存服务信息，在 Eureka Server 不可用时依然能够继续进行服务发现。</p>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </section>

        <!-- Considerations Section -->
        <section class="mb-16">
            <h2 class="text-3xl font-bold mb-8 text-gray-800 border-b pb-4 flex items-center">
                <i class="fas fa-exclamation-triangle icon-highlight"></i>使用 Eureka 的注意事项
            </h2>
            
            <div class="grid grid-cols-1 md:grid-cols-2 gap-6">
                <div class="bg-white rounded-lg shadow-md p-6">
                    <div class="flex items-start mb-4">
                        <i class="fas fa-network-wired text-indigo-500 text-xl mr-3 mt-1"></i>
                        <h3 class="text-xl font-bold text-gray-800">网络延迟和性能</h3>
                    </div>
                    <p class="text-gray-600">在大规模分布式系统中，Eureka Server 的性能和网络延迟可能会成为瓶颈。需要合理配置 Eureka Server 的集群模式，并优化网络配置以提高性能。</p>
                </div>
                
                <div class="bg-white rounded-lg shadow-md p-6">
                    <div class="flex items-start mb-4">
                        <i class="fas fa-heartbeat text-red-500 text-xl mr-3 mt-1"></i>
                        <h3 class="text-xl font-bold text-gray-800">服务实例的健康检查</h3>
                    </div>
                    <p class="text-gray-600">Eureka 本身并不提供健康检查功能。需要与其他工具（如 Hystrix、Spring Boot Actuator）结合使用，以监控服务实例的健康状态。</p>
                </div>
                
                <div class="bg-white rounded-lg shadow-md p-6">
                    <div class="flex items-start mb-4">
                        <i class="fas fa-database text-blue-500 text-xl mr-3 mt-1"></i>
                        <h3 class="text-xl font-bold text-gray-800">数据一致性</h3>
                    </div>
                    <p class="text-gray-600">Eureka 使用的复制协议可以保证注册表的数据一致性，但在极端情况下，可能会遇到数据不一致的问题。需要根据具体需求配置合理的心跳和续约时间。</p>
                </div>
                
                <div class="bg-white rounded-lg shadow-md p-6">
                    <div class="flex items-start mb-4">
                        <i class="fas fa-lock text-green-500 text-xl mr-3 mt-1"></i>
                        <h3 class="text-xl font-bold text-gray-800">安全性</h3>
                    </div>
                    <p class="text-gray-600">Eureka 默认的配置可能不包括安全性措施。在生产环境中，应该配置适当的安全策略，确保服务注册和发现的安全性。</p>
                </div>
            </div>
        </section>

        <!-- Configuration Example -->
        <section class="mb-16">
            <h2 class="text-3xl font-bold mb-8 text-gray-800 border-b pb-4 flex items-center">
                <i class="fas fa-code icon-highlight"></i>配置示例
            </h2>
            
            <div class="grid grid-cols-1 md:grid-cols-2 gap-8">
                <div>
                    <h3 class="text-xl font-semibold text-gray-800 mb-4 flex items-center">
                        <i class="fas fa-server text-indigo-500 mr-2"></i>Eureka Server 配置
                    </h3>
                    <div class="bg-gray-800 rounded-lg overflow-hidden">
                        <div class="flex items-center bg-gray-700 px-4 py-2">
                            <div class="flex space-x-2 mr-4">
                                <div class="w-3 h-3 rounded-full bg-red-500"></div>
                                <div class="w-3 h-3 rounded-full bg-yellow-500"></div>
                                <div class="w-3 h-3 rounded-full bg-green-500"></div>
                            </div>
                            <span class="text-gray-300 text-sm">application.yml</span>
                        </div>
                        <pre class="text-gray-300 p-4 overflow-x-auto"><code>spring:
  application:
    name: eureka-server
server:
  port: 8761
eureka:
  client:
    fetch-registry: false
    register-with-eureka: false
  server:
    enable-self-preservation: false</code></pre>
                    </div>
                </div>
                
                <div>
                    <h3 class="text-xl font-semibold text-gray-800 mb-4 flex items-center">
                        <i class="fas fa-laptop-code text-purple-500 mr-2"></i>Eureka Client 配置
                    </h3>
                    <div class="bg-gray-800 rounded-lg overflow-hidden">
                        <div class="flex items-center bg-gray-700 px-4 py-2">
                            <div class="flex space-x-2 mr-4">
                                <div class="w-3 h-3 rounded-full bg-red-500"></div>
                                <div class="w-3 h-3 rounded-full bg-yellow-500"></div>
                                <div class="w-3 h-3 rounded-full bg-green-500"></div>
                            </div>
                            <span class="text-gray-300 text-sm">application.yml</span>
                        </div>
                        <pre class="text-gray-300 p-4 overflow-x-auto"><code>spring:
  application:
    name: my-service
server:
  port: 8080
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/</code></pre>
                    </div>
                </div>
            </div>
            
            <div class="mt-8 bg-blue-50 rounded-lg p-6">
                <div class="flex items-start">
                    <i class="fas fa-info-circle text-blue-500 text-xl mr-3 mt-1"></i>
                    <div>
                        <h3 class="text-lg font-semibold text-gray-800 mb-2">配置说明</h3>
                        <p class="text-gray-600">在上述配置中，<code class="bg-blue-100 px-1 rounded">eureka-server</code> 是 Eureka Server 的应用名称，<code class="bg-blue-100 px-1 rounded">my-service</code> 是一个 Eureka Client 的应用名称。Eureka Server 运行在 8761 端口，而 Eureka Client 将向 Eureka Server 注册并获取其他服务的地址。</p>
                    </div>
                </div>
            </div>
        </section>

        <!-- Related Resources -->
        <section class="mb-16">
            <h2 class="text-3xl font-bold mb-8 text-gray-800 border-b pb-4 flex items-center">
                <i class="fas fa-book-open icon-highlight"></i>相关资源
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                        <h3 class="text-xl font-bold text-gray-800 mb-1">Spring Cloud 官方文档</h3>
                        <a href="https://www.yuque.com/jtostring/qiwsg9/springcloud" class="text-indigo-600 hover:text-indigo-800 transition duration-300" target="_blank">
                            https://www.yuque.com/jtostring/qiwsg9/springcloud
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    <!-- Mermaid JS -->
    <script src="https://cdn.jsdelivr.net/npm/mermaid@latest/dist/mermaid.min.js"></script>
    <script>
        mermaid.initialize({
            startOnLoad: true,
            theme: 'default',
            flowchart: {
                useMaxWidth: true,
                htmlLabels: true,
                curve: 'basis'
            }
        });
        
        // 平滑滚动
        document.querySelectorAll('a[href^="#"]').forEach(anchor => {
            anchor.addEventListener('click', function (e) {
                e.preventDefault();
                document.querySelector(this.getAttribute('href')).scrollIntoView({
                    behavior: 'smooth'
                });
            });
        });
    </script>
</body>
</html>
```